Ncert Exercises & Solutions

9.4 How can the production of dihydrogen, obtained from ‘coal gasification’, be increased?

Dihydrogen is produced by coal gasification method as:

$C_{g} + H_{2} O_{(g)} \overset{1270 K}{\to} C O (g) + {H_{2}}_{(g)}$
$(c o a l)$

The yield of dihydrogen (obtained from coal gasification) can be increased by reacting carbon monoxide (formed during the reaction) with steam in the presence of iron chromate as a catalyst.

$C O_{(g)} + H_{2} O_{(g)} \to_{C a t a l y s t}^{673 K} C O_{2 (g)} + {H_{2}}_{(g)}$

This reaction is called the water-gas shift reaction. Carbon dioxide is removed by scrubbing it with a solution of sodium arsenite.

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